Efforts to control a bushfire threatening multiple coastal towns north of Perth have continued overnight, with hundreds of firefighters battling the blaze.

An emergency bushfire warning has been activated north of Perth. Residents in Wedge Island, Grey, Nambung and surrounding areas have been told it's too late to leave.

Residents have been told to evacuate as a fire tears through parts of Wedge Island, Cooljarloo and Dandaragan.

An emergency warning is still in place for a blaze threatening the town of Cervantes, 200 kilometres north of Perth, with strong winds and high temperatures expected to test fire crews today.

An evacuation warning remains in place as an enormous bushfire bears down on the town of Cervantes on the coast of Western Australia.

Residents have been told it is too late to leave their properties as an out-of-control bushfire cuts evacuation routes from a series of coastal communities north of Perth. An emergency warning is in place for parts of Wedge Island, Grey, Cervantes, Nambung and Cooljarloo in the Shire of Dandaragan in Western Australia.

Residents of Cervantes are being told to evacuate immediately, with a massive fire that was first sparked by a car crash threatening the small fishing town.